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	<h2> 提交记录 7804 </h2>
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					<th class="col-xs-2"> 用户 </th>
					<th class="col-xs-3"> 题目 </th>
					<th class="col-xs-2"> 状态 </th>
					<th class="col-xs-1"> 得分 </th>
					<th class="col-xs-1"> 用时 </th>
					<th class="col-xs-1"> 内存 </th>
					<th class="col-xs-1"> 语言 </th>
					<th class="col-xs-1"> 代码长度 </th>
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					<td style='font-size:13px'> <a href='/user/profile/JacaJava/index.html'> JacaJava </a> </td>
<td> <a href='/problem/1002/index.html'> 1002. 测测你的多项式乘法 </a> </td>
<td> Accepted </td>
<td> 100 </td>
<td style='font-size:13px'> 624.847 ms </td>
<td style='font-size:13px'> 79 MB + 680 KB </td>
<td style='font-size:13px'> C++ </td>
<td style='font-size:13px'> 1.29 KB </td>
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					<th class="col-xs-6"> 提交时间 </th>
					<th class="col-xs-6"> 评测时间 </th>
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					<td style='font-size:13px'> 2019-01-25 11:08:44 </td>
<td style='font-size:13px'> 2019-01-25 11:08:47 </td>
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				<label for="code"> 代码 </label>
				<pre style="background-color:white"><code class="cpp">#include&lt;stdio.h&gt;
#include&lt;math.h&gt;
#include&lt;algorithm&gt;
using namespace std;
typedef double du;
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
struct cp{
	du x,y;
	cp(const du x=0,const du y=0):x(x),y(y){}
};
inline cp operator+(const cp&amp;a,const cp&amp;b){return cp(a.x+b.x,a.y+b.y);}
inline cp operator-(const cp&amp;a,const cp&amp;b){return cp(a.x-b.x,a.y-b.y);}
inline cp operator*(const cp&amp;a,const cp&amp;b){return cp(a.x*b.x-a.y*b.y,a.x*b.y+a.y*b.x);}
int rev[1&lt;&lt;21],N;
cp*w[21];
void pre(int n){
	int i,j,k;
	for(N=1,k=0;N&lt;=n;N&lt;&lt;=1)k++;
	for(i=0;i&lt;N;i++)rev[i]=(rev[i&gt;&gt;1]&gt;&gt;1)|((i&amp;1)&lt;&lt;(k-1));
	for(i=2,k=0;i&lt;=N;i&lt;&lt;=1,k++){
		w[k]=new cp[i&gt;&gt;1];
		for(j=0;j&lt;i&gt;&gt;1;j++)w[k][j]=cp(cos(j*M_PI/(i/2)),sin(j*M_PI/(i/2)));
	}
}
void fft(cp*a,int on){
	int i,j,k,f;
	cp t;
	for(i=0;i&lt;N;i++){
		if(i&lt;rev[i])swap(a[i],a[rev[i]]);
	}
	for(i=2,f=0;i&lt;=N;i&lt;&lt;=1,f++){
		for(j=0;j&lt;N;j+=i){
			for(k=0;k&lt;i&gt;&gt;1;k++){
				t=w[f][k];
				t.y*=on;
				t=t*a[i/2+j+k];
				a[i/2+j+k]=a[j+k]-t;
				a[j+k]=a[j+k]+t;
			}
		}
	}
	if(on==-1){
		for(i=0;i&lt;N;i++)a[i].y/=N;
	}
}
cp A[1&lt;&lt;21];
void poly_multiply(unsigned*a,int n,unsigned*b,int m,unsigned*c){
	int i;
	pre(n+m);
	for(i=0;i&lt;=n;i++)A[i].x=a[i];
	for(i=0;i&lt;=m;i++)A[i].y=b[i];
	fft(A,1);
	for(i=0;i&lt;N;i++)A[i]=A[i]*A[i];
	fft(A,-1);
	for(i=0;i&lt;=n+m;i++)c[i]=llround(A[i].y*.5);
}</code></pre>
				<br />
				
				<label for="result"> 评测结果 </label><div class="row"><div class="col-xs-12"><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Compilation</b></td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">Compile OK</td><td class="col-xs-2" style="vertical-align:middle">Score: N/A</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_1" aria-expanded="false" aria-controls="detail_1">显示更多</a></td></tr></table></div><div class="collapse" id="detail_1"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>Compiling...
Compile success!
</textarea></div></div><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Testcase #1</b></td><td class="col-xs-2" style="vertical-align:middle">624.847 ms</td><td class="col-xs-2" style="vertical-align:middle">79 MB + 680 KB</td><td class="col-xs-2" style="vertical-align:middle">Accepted</td><td class="col-xs-2" style="vertical-align:middle">Score: 100</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_2" aria-expanded="false" aria-controls="detail_2">显示更多</a></td></tr></table></div><div class="collapse" id="detail_2"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>verdict = Run Finished
time_ms = 624.847315
mem_kb = 81576
Correct Answer
</textarea></div></div></div></div>
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